Key points from article :
More people are surviving into their late 80s and beyond.
Many people who reach 70th birthday can still expect to live another 15 years.
In 1951 men and women around the age of 60 could expect to live another 15 years.
By 2057, experts predict this average age will rise further to 75.
Most people still experienced a period of poor health at the end of their lives.
